package com.ybwh.springboot1.conf;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.http.converter.json.GsonHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.client.RestTemplate;

import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.List;

@Configuration
public class RestTemplateConfig {

	@Bean
	public RestTemplate restTemplate(ClientHttpRequestFactory factory) {
		RestTemplate restTemplate = new RestTemplate(factory);
		return restTemplate;
	}
	

	@Bean
	public ClientHttpRequestFactory simpleClientHttpRequestFactory() {
		SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
		// 单位为ms
		factory.setReadTimeout(5000);
		// 单位为ms
		factory.setConnectTimeout(5000);
		return factory;
	}

//	@Bean
//	@ConditionalOnMissingBean({RestTemplate.class})
	public RestTemplate restTemplateOfFastJson(ClientHttpRequestFactory factory) {
		RestTemplate restTemplate = new RestTemplate(factory);

		//换上fastjson
		List<HttpMessageConverter<?>> httpMessageConverterList= restTemplate.getMessageConverters();
		Iterator<HttpMessageConverter<?>> iterator=httpMessageConverterList.iterator();
		if(iterator.hasNext()){
			HttpMessageConverter<?> converter=iterator.next();
			//原有的String是ISO-8859-1编码 去掉
			if(converter instanceof StringHttpMessageConverter){
				iterator.remove();
			}

			//由于系统中默认有jackson 在转换json时自动会启用  但是我们不想使用它 可以直接移除或者将fastjson放在首位
            if(converter instanceof GsonHttpMessageConverter || converter instanceof MappingJackson2HttpMessageConverter){
                iterator.remove();
            }

		}
		httpMessageConverterList.add(new StringHttpMessageConverter(Charset.forName("utf-8")));
		FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
		FastJsonConfig fastJsonConfig = new FastJsonConfig();
		fastJsonConfig.setSerializerFeatures(
				SerializerFeature.WriteMapNullValue,
				SerializerFeature.WriteNullStringAsEmpty,
				SerializerFeature.WriteNullListAsEmpty,
				SerializerFeature.DisableCircularReferenceDetect);

		fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
		httpMessageConverterList.add(0,fastJsonHttpMessageConverter);

		return restTemplate;

	}

}
